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From: Andrii Nakryiko <andriin@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
Cc: <andrii.nakryiko@gmail.com>, <kernel-team@fb.com>,
	Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH v2 bpf-next 1/2] selftests/bpf: enforce libbpf build before BPF programs are built
Date: Fri, 11 Oct 2019 15:01:45 -0700
Message-ID: <20191011220146.3798961-2-andriin@fb.com> (raw)
In-Reply-To: <20191011220146.3798961-1-andriin@fb.com>

Given BPF programs rely on libbpf's bpf_helper_defs.h, which is
auto-generated during libbpf build, libbpf build has to happen before
we attempt progs/*.c build. Enforce it as order-only dependency.

Fixes: 24f25763d6de ("libbpf: auto-generate list of BPF helper definitions")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
 tools/testing/selftests/bpf/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 40552fb441e5..f958643d36da 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -256,7 +256,8 @@ ifeq ($(DWARF2BTF),y)
 	$(BTF_PAHOLE) -J $@
-$(OUTPUT)/%.o: progs/%.c
+# libbpf has to be built before BPF programs due to bpf_helper_defs.h
+$(OUTPUT)/%.o: progs/%.c | $(BPFOBJ)
 	($(CLANG) $(BPF_CFLAGS) $(CLANG_CFLAGS) -O2 -target bpf -emit-llvm \
 		-c $< -o - || echo "clang failed") | \
 	$(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@

  reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11 22:01 [PATCH v2 bpf-next 0/2] selftests/bpf Makefile cleanup and fixes Andrii Nakryiko
2019-10-11 22:01 ` Andrii Nakryiko [this message]
2019-10-11 22:01 ` [PATCH v2 bpf-next 2/2] selftests/bpf: remove obsolete pahole/BTF support detection Andrii Nakryiko
2019-10-12  7:15 ` [Potential Spoof] [PATCH v2 bpf-next 0/2] selftests/bpf Makefile cleanup and fixes Martin Lau
2019-10-12 23:22   ` Alexei Starovoitov

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